Operation
Three electronics versions are available
for operating the Cerabar M.
•
The analogue electronics is the
simplest and most cost-effective
method to operate the Cerabar M.
•
Smart electronics opens up a wide
range of operating and calibration
routines. It can then be operated
either by means of a handheld
terminal or an operating program (e.g.
Hauser Commuwin II).
•
The PROFIBUS-PA electronics provide
direct connection to the PROFIBUS-PA
field bus. The PROFIBUS-PA can be
easily set up and many values are
retrievable from the control room.
Analogue Electronics
For the Cerabar M with analogue
electronics lower range-value (Zero)
and upper range-value (Span) are
directly calibrated at the measuring
point via two potentiometers. The
required lower and upper range-values
must be applied as reference pressure.
•
For coarse calibration of the
measuring span, a spread between
TD 1:1 and TD 10:1 can be selected
using DIP switches.
•
A 2 s damping of the measured value
can be activated using a DIP switch.
•
The analogue display shows the
pressure on a bar graph as a ratio to
the measuring range.
•
Over- or under-run of the signal can
be indicated by a flashing of the bar
graph.
Smart Electronics
A Cerabar M with Smart electronics can
be calibrated with or without reference
pressure.
– When calibrating with reference
pressure, the pressure for lower
range-value and upper range-value
must be entered and confirmed by
pressing the Zero or Span key twice.
Press these keys once to display saved
values for lower range-value and upper
range-value.
– If you calibrate without reference
pressure, enter the measuring points
using a handheld terminal or using an
operating program.
•
A damping of 2 s can be set directly
on the instrument. A damping value of
0...40 s can be selected using
communication.
•
The digital display shows the pressure
as a four-character number. The
appropriate 4…20 mA current is
shown as a bar graph underneath.
•
Error codes on the digital display and
in Commuwin II simplify error
diagnosis.
τ
τ
τ
1
off
on
2 3
1
off
on
2 3
1
off
on
2 3
τ
1
off
on
2 3
τ
1
off
on
2 3
fine
coarse
τ
Zero
Span
1
off
on
2 3
1 2
+
–
3
Display
Zero
Span
fine
1
2
3
τ
coarse
Potentiometer for
calibrating the
lower range-value
TD 1:1
TD 3:1
TD 6:1
TD 10:1
Switch position “on”
Damping = 2 s activated
Potentiometer and switches
for calibrating the upper range-value
Operating elements
Analogue display
(optional)
Damping switch
Coarse adjustment
for upper range-value
TD: turn down
Zero
Damping
on
Span
1
2
+
–
3
Zero
Damping
on
off
Span
Display
off
0,753
Digital display
(optional)
Keys for
calibrating the
lower range-
value
and upper
range-value
Lower range-
value:
Display
1 x
Registration
1 x
Upper range-
value:
Display
2 x
2 x
Registration
Switch position "on"
Damping = 2 s activated
Operating elements
7
Summary of Contents for cerabar M PMP 46
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